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GTECH Calibration
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P1554

Cruise Engaged Circuit High Voltage.

  • GM
  • Powertrain
  • Manufacturer code
  • Low severity

How this code is built

P
SystemPowertrain
1
Defined byThe manufacturer
5
AreaVehicle speed, idle control and auxiliary inputs
54
FaultThe specific fault in that area

What it means

P1554 on GM vehicles means the control module has detected a high voltage on the cruise engaged circuit. The module monitors this circuit to know when cruise control is active, and it saw a voltage higher than expected for the current operating state. The exact circuit layout and the module that monitors it vary by model and year, so check the wiring information for the specific vehicle.

Symptoms

  • Cruise control will not engage or drops out unexpectedly
  • Cruise control indicator light behaves oddly or stays on or off
  • Malfunction indicator lamp may be on
  • Brake lamp or cruise cancel behaviour seems inconsistent on some models
  • Fault stored with no other noticeable change in driveability

Possible causes

  • Faulty or misadjusted brake pedal switch or cruise release switchlikely
  • Cruise control switch or steering wheel control faultlikely
  • Short to voltage in the cruise engaged circuit wiringpossible
  • Corroded, loose or damaged connector terminals on the circuitpossible
  • Fault with the cruise control module or servo, where fittedpossible
  • Internal fault in the engine control modulerare

How to diagnose

  1. Read the stored codes and freeze frame data, noting any other cruise, brake switch or electrical codes, then record before clearing
  2. Check cruise control operation and the dashboard indicator to see whether the fault is constant or intermittent
  3. Inspect the brake pedal switch and cruise release switch for correct adjustment, damage and operation
  4. Inspect the wiring and connectors on the cruise engaged circuit for chafing, water ingress, corrosion and pushed-back pins
  5. Using the wiring diagram for the vehicle, measure the circuit voltage with the switches in each position and compare with the specification
  6. Check the circuit for a short to voltage with the connectors disconnected and the ignition off or on as the procedure requires
  7. Check the cruise control switch and, where fitted, the cruise module or servo against the model-specific test procedure
  8. Check for a software update or technical bulletin for the vehicle only after the wiring and components have been proven good

How to fix

  • Replace or correctly adjust a faulty brake pedal or cruise release switch
  • Replace a faulty cruise control switch or steering wheel control assembly
  • Repair the wiring that is shorted to voltage or damaged, and secure it correctly
  • Clean or repair corroded or damaged connector terminals, or replace the connector
  • Replace a faulty cruise control module or servo as indicated by testing
  • Replace or reprogram the control module only if testing proves it faulty or an outdated calibration is a known cause

Can I keep driving?

Low severity

The car is normally safe to drive, but cruise control may not work. Book it in for diagnosis, especially if the brake switch is suspected, since it also controls the brake lamps.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.

This code for other makes

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